Cameras Failing To Display

I am not sure if anyone else has had this issue before and if they could help. We have been upgrading our older cameras to IP cameras and sometimes we will randomly get a camera that we can see when we us the IP but in our DVTel system the camera does not show up. HELP Please as this now is the third one we are having issues with.

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********, ***** ************/***** ** ** ******? *** *** **** ****? DVTel *******? ***** ***** *******?

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*** ********* *** ********* *** *** *** ***** ******.

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